完善角色与消息权限：收紧板管内容处置，彻底删除仅站长，并统一管理删帖/评弹窗。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/admin/page.tsx

@@ -21,7 +21,7 @@ import {
 } from "@/lib/api";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached } from "@/lib/serverData";
-import { canModerateAny, isSuperOrOwner, isAdminOrAbove } from "@/lib/roles";
+import { canModerateAny, isSuperOrOwner, isAdminOrAbove, ROLES } from "@/lib/roles";
 import { AdminPageHeader, AdminStatCard } from "@/components/admin";
 import DashboardClient from "./DashboardClient";
 
@@ -115,9 +115,12 @@ export default async function AdminDashboardPage() {
   const canMod = canModerateAny(me.user);
   const canUsers = isSuperOrOwner(me.user?.role);
   const canEconomy = isAdminOrAbove(me.user?.role);
+  const boardScoped = me.user?.role === ROLES.BOARD_ADMIN;
 
   const [overview, pendingCounts, analytics] = await Promise.all([
-    fetchOverview(cookie).catch(() => null),
+    boardScoped
+      ? Promise.resolve(null)
+      : fetchOverview(cookie).catch(() => null),
     canMod
       ? fetchAdminPendingCounts(cookie).catch(() => ({ posts: 0, comments: 0 }))
       : Promise.resolve(null),
@@ -133,7 +136,15 @@ export default async function AdminDashboardPage() {
   }).format(now);
 
   const stats = overview?.stats;
-  const newUsers = overview?.new_users ?? [];
+  const newUsers = boardScoped ? [] : overview?.new_users ?? [];
+
+  // 板管：今日内容用授权板 analytics 序列今日点；隐藏全站注册/在线卡的误导数字
+  const todayPosts = boardScoped
+    ? analytics.posts_series[analytics.posts_series.length - 1]?.count ?? 0
+    : stats?.today_posts ?? 0;
+  const todayComments = boardScoped
+    ? analytics.comments_series[analytics.comments_series.length - 1]?.count ?? 0
+    : stats?.today_comments ?? 0;
 
   return (
     <div>
@@ -155,30 +166,34 @@ export default async function AdminDashboardPage() {
         <AdminStatCard
           label="今日 PV"
           value={fmt(analytics.today_pv)}
-          hint={`独立访客 UV ${fmt(analytics.today_uv)}`}
+          hint={boardScoped ? "仅全站可见（板管不展示）" : `独立访客 UV ${fmt(analytics.today_uv)}`}
           icon={<Eye size={16} />}
         />
         <AdminStatCard
           label="今日 UV"
           value={fmt(analytics.today_uv)}
-          hint="独立访客"
+          hint={boardScoped ? "板管仪表盘不含全站 UV" : "独立访客"}
           icon={<Users size={16} />}
           color="var(--ok)"
           soft="var(--ok-soft)"
         />
         <AdminStatCard
           label="今日内容"
-          value={fmt(stats?.today_posts ?? 0)}
+          value={fmt(todayPosts)}
           sub="帖"
-          hint={`评论 ${fmt(stats?.today_comments ?? 0)} · 注册 ${fmt(stats?.today_users ?? 0)}`}
+          hint={
+            boardScoped
+              ? `评论 ${fmt(todayComments)} · 授权板块`
+              : `评论 ${fmt(todayComments)} · 注册 ${fmt(stats?.today_users ?? 0)}`
+          }
           icon={<FileText size={16} />}
           color="var(--gold)"
           soft="var(--gold-soft)"
         />
         <AdminStatCard
           label="在线"
-          value={fmt(stats?.online ?? 0)}
-          hint={`峰值 ${fmt(stats?.peak_online ?? 0)}`}
+          value={boardScoped ? "—" : fmt(stats?.online ?? 0)}
+          hint={boardScoped ? "板管不展示全站在线" : `峰值 ${fmt(stats?.peak_online ?? 0)}`}
           icon={<Activity size={16} />}
           color="var(--clay)"
           soft="var(--clay-soft)"